My final render with cycles look blurry after denoise
What sample count did you use? If the sample count is low, of course it will look blurry after denouse. This is not related to light bounces at all. If you wan't a sharper image after denoising, you will have to increase your sample count.
At sample counts as low as 128 for the final render, your render will look blurry after denoising. Nice interior by the way.